Skylab, which was America's first space station, was manned for 171 days by three crews during 1973 and 1974. The space station included the Apollo Telescope Mount (ATM), which astronauts used to take more than 150,000 images of the Sun. Skylab was abandoned in February 1974 and re-entered the Earth's atmosphere in 1979.

The Solar Maximum Mission (SMM) was designed to provide coordinated observations of solar activity, in particular solar flares, during a period of maximum solar activity. The spacecraft suffered an on-orbit failure. A repair mission on STS-41C in 1984, during which shuttle astronauts rendezvoused with SMM, was successful. SMM collected data until Nov. 24, 1989, and re-entered on Dec. 2, 1989.

The Ulysses spacecraft is an international project to study the
poles of the Sun and interstellar space above and below the poles. It
used Jupiter as a gravity assist to swing out of the
ecliptic plane and
onward to the poles of the Sun. The Jupiter flyby was on February 8, 1992.
The first solar polar passage was in June 1994.
The spacecraft passed the solar equator in February 1995 and passed
over the north pole in June 1995.

The main scientific purpose of SOHO (Solar and Helispheric Observatory)
is to study the Sun's internal structure, by observing velocity
oscillations and radiance variations, and to look at the physical
processes that form and heat the Sun's corona and that give rise to the
solar wind, using imaging and spectroscopic diagnosis of the plasma in
the Sun's outer regions coupled with in-situ measurements of the solar
wind. SOHO will be put into a "halo orbit" around the L1 Lagrange point
-- the point 1.5 million kilometers (932,000 miles) away from us
at which the gravitational pull of the Earth balances that of the Sun.

Genesis - USA Solar Wind Sample Return - 8 August 2001

The primary objective of the Genesis mission is to collect
samples of solar wind particles and return them to Earth for detailed
analysis.

Mariner 10 was the first dual planet mission. It flew past Venus on February
5, 1974 for a gravity assist to the planet Mercury. Mariner 10 was the
first spacecraft to have an imaging system.
It flew past Mercury 3 times on March 29, 1974,
September 21, 1974, and March 16, 1975. These three encounters produced over
10,000 pictures with 57% planet coverage. It recorded surface temperatures
ranging from 187°C to -183°C on the day and night sides. A
weak magnetic field was detected but it failed to detect an atmosphere.
Mariner 10 is now in a solar orbit.

On December 14, 1962, Mariner 2 arrived at Venus at a distance of 34,800 kilometers
and scanned its surface with infrared and microwave
radiometers, capturing data that showed Venus's surface to be
about 425°C (800°F). Three weeks after the Venus flyby
Mariner 2 went off the air on January 3, 1963. It is now in a solar orbit.

Venera 4 arrived at Venus on October 18, 1967. This was the first probe
to be placed directly into the atmosphere and to return atmospheric data.
It showed that the atmosphere was 90-95% carbon dioxide. It detected no
nitrogen. The surface temperature reading was 500°C and pressure
reading was 75 bar. It was crushed by the pressure on Venus before it
reached the surface.

Mariner 5 arrived at Venus on October 19, 1967, one day after Venera 4. It
passed within 3,900 kilometers of the planet's surface. It studied the Venusian
magnetic field and found that its atmosphere was composed of 85-99%
carbon dioxide. It is now in a solar orbit.

Venera 5 arrived at Venus on May 16, 1969. Along with Venera 6, atmospheric
data was returned indicating an atmosphere composed of 93-97% carbon
dioxide, 2-5% nitrogen, and less than 4% oxygen. The probe
returned data down to within 26 kilometers of surface and was then lost -
crushed by the pressure on Venus.

Venera 6 arrived at Venus on May 17, 1969. Along with Venera 5, atmospheric
data was returned indicating an atmosphere composed of 93-97% carbon
dioxide, 2-5% nitrogen, and less than 4% oxygen. The probe
returned data down to within 11 kilometers of surface and was then lost -
crushed by the pressure on Venus.

Venera 7 arrived at Venus on December 15, 1970 and was the first
successful landing of a spacecraft on another planet. It used an
external cooling device which allowed it to send back 23 minutes of data.
The surface temperature was 475°C, and surface pressure was 90 bar.

Venera 8 arrived at Venus on July 22, 1972. It measure wind speed variations
as it descended through the atmosphere: 100 meters/second above 48 kilometers, 40-47 meters/second at
42-48 kilometers, and 1 meter/second below 10 kilometers. It returned data for 50 minutes after
it landed.

Mariner 10 was the first dual planet mission. It flew past Venus on February
5, 1974 for a gravity assist to the planet Mercury. Mariner 10 was the
first spacecraft to have an imaging system. It recorded circulation in
the Venusian atmosphere and showed the temperature of the cloud tops to
be -23°C. It is now in a solar orbit.

Venera 9 arrived at Venus on October 22, 1975, three days before the
arrival of its sister spacecraft, Venera 10. Both orbiters photographed
the clouds and looked at the upper atmosphere. Differences in cloud
layers were discovered at 57-70 kilometers, 52-57 kilometers and 49-52
kilometers from the surface. The lander arrived on the Venusian
surface on November 22, 1975. During a period of 53 minutes, it
transmitted the first black and white images of the planets surface. It
showed sharp-edged flat rocks and a basaltic terrain. The probe in now in
a Venus orbit.

Venera 10 arrived at Venus on October 25, 1975, three days after the
arrival of its sister spacecraft Venera 9. Both orbiters photographed
the clouds and looked at the upper atmosphere. Differences in cloud
layers were discovered at 57-70 kilometers, 52-57 kilometers and 49-52
kilometers from the surface. The lander arrived on the Venusian
surface on November 25, 1975. During a period of 65 minutes, it
transmitted black and white images of the planets surface. The terrain
was more eroded than at the Venera 9 landing site.

Pioneer Venus 1 - USA Venus Orbiter - 582 kg - (May 20, 1978 - 1992)

Pioneer Venus 1 (also known as Pioneer 12) arrived at Venus
on December 4, 1978. It operated continuously from 1978 until October 8,
1992, when contact was lost with the spacecraft. It was expected
to burn up in the Venusian atmosphere 6 days later. The
orbiter was the first spacecraft to use radar in mapping the planet's
surface. The electron field experiment detected radio bursts presumably
caused by lightening. No magnetic field was detected. From 1978 to 1988 the
amount of sulfur dioxide in the atmosphere decreased by 10%. The reason
for this decrease is unknown. Perhaps a large volcano erupted just
before the orbiter arrived and the amount of sulfur dioxide slowly
declined.

Pioneer Venus 2 (also know as Pioneer 13) carried four atmospheric probes.
One large and three smaller ones. They arrived at Venus on December 9, 1978
and plunged into the atmosphere. The four probes descended through the
atmosphere by parachute while the spacecraft burned up high in the
atmosphere. At a height of 70-90 kilometers the probes encountered a fine haze
layer. Between 10-50 kilometers there was little atmospheric
convection and below 30 kilometers the
atmosphere was clear.

Venera 13 landed on Venus on March 1, 1982. It returned black and white, and
the first color panoramic views of the Venusian surface. It also
conducted soil analysis using an x-ray fluorescence spectrometer. The
sample was determined to be leucite basalt, a rare rock type on the Earth.

Venera 14 landed on Venus on March 5, 1982. It returned black and white, and
color panoramic views of the Venusian surface. It also
conducted soil analysis using an x-ray fluorescence spectrometer. The
sample was determined to be tholeiitic basalt similar to that found at
mid-ocean ridges on the Earth.

Venera 15 arrived at Venus on October 10, 1983. Its high-resolution imaging
system produced images at 1-2 kilometers in resolution. Venera 15 and 16 produced
a map of the northern hemisphere from the pole to 30°N. They found several
hot spots, possibly caused from volcanic activity.

Venera 16 arrived at Venus on October 14, 1983. Its high-resolution imaging
system produced images at 1-2 kilometers in resolution. Venera 15 and 16 produced
a map of the northern hemisphere from the pole to 30°N. They found several
hot spots, possibly caused from volcanic activity.

Vega 1 flew past Venus on June 11, 1985 on its way for a flyby with comet
Halley. It dropped off a Venera style lander and a balloon to investigate
the Venusian middle cloud layer. The lander's soil experiment failed. The
balloon floated in the atmosphere for about 48 hours at an altitude of 54
kilometers. Between Vega 1 and 2, downward gusts of 1 meter/second were
encountered and wind velocities of up to 240 kilometers/hour. The Comet
Halley flyby took place on March 6, 1986. The Vega 1 probe is now in a
solar orbit.

Vega 2 flew past Venus on June 15, 1985 on its way for a flyby with comet
Halley. It dropped off a Venera style lander and a balloon to investigate
the Venusian middle cloud layer. The lander's soil experiment sampled
anorthosite-troctolite which is found in the lunar highlands but is rare
on Earth. The balloon floated in the atmosphere for about 48 hours at an
altitude of 54 kilometers. Between Vega 1 and 2, downward gusts of 1
meter/second were encountered and wind velocities of up to 240
kilometers/hour. The Comet Halley flyby took place on March 9, 1986.
The Vega 2 probe is now in a solar orbit.

Galileo was designed to study Jupiter's atmosphere, satellites and
surrounding magnetosphere for 2 years. In order to get there, it used
gravity assist techniques to pick up speed by flying past Venus on
February 10, 1990. It then flew past the Earth & Moon
on December 8, 1990 and then again on December 8, 1992. It has
made encounters asteroid 951 Gaspra on October 29, 1991, and asteroid
243 Ida on August 28, 1993.

Magellan was released into Earth's orbit from a space shuttle and then
injected into a transfer orbit to Venus by an upper stage.
Its primary mission was to map Venus using synthetic aperture radar.
The surface of Venus is obscured by thick clouds of carbon dioxide
that makes the surface invisible to optical instruments. Magellan arrived at
Venus on August 10, 1990. Its radar imaging system was able to produce images
at 300 meters/pixel resolution.
The spacecraft mapped 99 percent of the
planet's surface. In 1994, controllers directed the
orbiter into the atmosphere, where it burned up.

Crew: Thomas Stafford, Eugene A. Cernan, John W. Young.
Manned lunar fly-around and Earth return. Stafford and Cernan tested the Lunar Module, separating it from the Command and Service Module and descended to within
50,000 feet of the lunar surface. The astronauts acquired a large number of excellent
70-mm photographs.

Crew: Neil A. Armstrong, Edwin E. Aldrin, Jr., Michael Collins.
Apollo 11 was the first manned lunar landing, which took place on
July 20, 1969. The landing site was Mare Tranquillitatis
at latitude 0°67' N and longitude 23°49' E. Armstrong and Aldrin collected 21.7 kilograms of soil and rock samples and deployed experiments.

Crew: Charles Conrad Jr., Alan L. Bean, Richard F. Gordon, Jr.
Apollo 12 was a manned lunar landing which took place on November 19, 1969.
The landing site was Oceanus Procellarum at latitude 3°12' S
and longitude 23°23' W. This was the landing site for Surveyor 3.
Conrad and Bean retrieved portions of Surveyor 3, including the camera.
Samples amounting to 34.4 kilograms were returned from the moon. Astronauts also deployed the Apollo lunar surface experiment package (ALSEP), an automated research station which was also deployed by all subsequent lunar crews.

Crew: James A. Lovell, Jr., Fred W. Haise, Jr., John L. Swigert, Jr.
The Apollo 13 mission became one of survival for the astronauts on board.
During the translunar coast an explosion destroyed both power and
propulsion systems of the Command Service Module. The Lunar Module
was used as a lifeboat for the astronauts.

Luna 16 - USSR Lunar Lander - 5,600 kg - (September 12, 1970)

Landed on September 20, 1970 at Mare Fecunditaits located at
latitude 0°41' S and longitude 56°18' E.
A return vehicle brought 100 grams
of lunar samples to Earth.

Crew: Alan B. Shepard, Jr., Edgar D. Mitchell, Stuart A. Roosa.
Shepard and Mitchell landed on the moon on February 5, 1971, in the Fra Mauro highlands, located at
3°40' S and longitude 17°28' E.
They collected 42.9 kilograms of lunar samples and used a hand-held cart to transport rocks and equipment.

Crew: David R. Scott, James B. Irwin, Alfred M. Worden.
Scott and Irwin landed on the moon on July 30, 1971. The landing site was
Hadley-Apennine at latitude 26°6' N and longitude
3°39' E. They collected samples amounting to 76.8 kilograms.
A lunar Roving Vehicle was carried on this mission (and all subsequent ones) which allowed the astronauts to travel several kilometers from the landing site. The commander service module was the first to carry orbital sensors and to release a subsatellite into lunar orbit. Worden performed the first deep spacewalk to retrieve film from the service module.

Landed on the moon and returned samples to the Earth.
Landed on February 21, 1972 at Apollonius highlands located at
latitude 3°32' N and longitude 56°33' E. 30 grams of lunar
samples were returned to the Earth.

Crew: Eugene A. Cernan, Harrison H. Schmitt, and Ronald B. Evans.
Cernan and Schmitt landed on the moon on December 12, 1972.
The landing site was Taurus-Littrow
at latitude 20°10' N and longitude 30°46' E. They returned 110.5 kg of rock and soil samples. The astronauts covered 30.5 kilometers in the lunar rover during a 75-hour stay.

The official name for Clementine is "Deep Space Probe Science
Experiment" (DSPSE). It was a Department of Defense program used
to test new space technology. Clementine was a new design using
lightweight structure and propellant systems. It spent 70 days
(between February 6 and May 5, 1994) in lunar orbit. Its four cameras
mapped the surface of the Moon at 125-250 meters/pixel resolution.
Clementine also used a laser to gather altimeter data which will make
it possible to generate the first lunar topographic map.

Lunar Prospector was launched on January 6, 1998 and arrived at the
Moon on January 11, 1998. It is designed for a low polar orbit investigation of
the Moon, including the mapping of surface composition and possible ice
deposits, the measuring of magnetic and gravity fields, and the study of
lunar outgassing events. This data could help scientists plan a
potential lunar base and develop theories of the formation of the Moon,
Earth and Solar System. Its mission is scheduled to last one to three
years.

SMART 1 - ESA Lunar Orbiter - 27 September 2003

The SMART-1 (Small Missions for Advanced Research in Technology 1)
is a lunar orbiter designed to test spacecraft technologies for
future missions such as a solar-powered ion drive. It is to
return data on the geology, morphology, topography, mineralogy,
geochemistry, and exospheric environment of the Moon.

Kaguya is a lunar orbiter designed to take a global survey of the Moon, obtaining data on elemental
abundance, mineralogical composition, topography, geology, gravity, and the lunar and
solar-terrestrial plasma environments and to develop critical technologies for future lunar exploration.

The Lunar Reconnaissance Orbiter (LRO) is a Moon orbiting mission launched in June 2009. The
first mission of NASA's Robotic Lunar Exploration Program, it is designed to map the surface
of the Moon and characterize future landing sites in terms of terrain roughness, usable
resources, and radiation environment.

Mariner 4 arrived at Mars on July 14, 1965 and passed within 9,920 kilometers of the
planet's surface. It returned 22 close-up photos showing a cratered surface.
The thin atmosphere was confirmed to be composed of carbon dioxide in the
range of 5-10 mbar. A small intrinsic magnetic field was detected. Mariner
4 is now in a solar orbit.

Mariner 6 arrived at Mars on February 24, 1969, and passed within 3,437 kilometers
of the planet's equatorial region. Mariner 6 and 7 took measurements of the
surface and atmospheric temperature, surface molecular composition,
and pressure of the atmosphere. In addition, over 200 pictures were taken.
Mariner 6 is now in a solar orbit.

Mariner 7 arrived at Mars on August 5, 1969, and passed within 3,551 kilometers
of the planet's south pole region. Mariner 6 and 7 took measurements of the
surface and atmospheric temperature, surface molecular composition,
and pressure of the atmosphere. In addition, over 200 pictures were taken.
Mariner 7 is now in a solar orbit.

Mariner 8 - USA Mars Flyby - (May 8, 1971)

Failed to reach Earth orbit.

Kosmos 419 - USSR Mars Probe - (May 10, 1971)

Failed to leave Earth orbit.

Mars 2 - USSR Mars Orbiter/Soft Lander - 4,650 kg - (May 19, 1971)

The Mars 2 lander was released from the orbiter on November 27, 1971.
It crashed-landed because its breaking rockets failed - no data was
returned and the first human artifact was created on Mars. The orbiter
returned data until 1972.

Mars 3 - USSR Mars Orbiter/Soft Lander - 4,643 kg - (May 28, 1971)

Mars 3 arrived at Mars on December 2, 1971. The lander was released and
became the first successful landing on Mars. It failed after relaying 20 seconds
of video data to the orbiter. The Mars 3 orbiter returned data until August, 1972.
It made measurements of surface temperature and atmospheric composition.

Mariner 9 arrived at Mars on November 3, 1971 and was placed into orbit on
November 24. This was the first US spacecraft to enter an orbit around a
planet other than the Moon. At the time of its arrival a huge dust storm
was in progress on the planet. Many of the scientific experiments were
delayed until the storm had subsided. The first hi-resolution images of the
moons Phobos and Deimos
were taken. River and channel like
features were discovered. Mariner 9 is still in Martian orbit.

Mars 4 - USSR Mars Orbiter - 4,650 kg - (July 21, 1973)

Mars 4 arrived at Mars on February, 1974, but failed to go into orbit due
to a malfunction of its breaking engine.
It flew past the planet with in 2,200 kilometers of
the surface. It returned some images and data.

Mars 5 - USSR Mars Orbiter - 4,650 kg - (July 25, 1973)

Mars 5 entered into orbit around Mars on February 12, 1974. It acquired
imaging data for the Mars 6 and 7 missions.

Mars 6 - USSR Mars Orbiter/Soft Lander - 4,650 kg - (August 5, 1973)

On March 12, 1974, Mars 6 entered into orbit and launched its lander.
The lander returned atmospheric descent data, but failed on its way down.

Mars 7 - USSR Mars Orbiter/Soft Lander - 4,650 kg - (August 9, 1973)

On March 6, 1974, Mars 7 failed to go into orbit about Mars and the
lander missed the planet. Carrier and lander are now in a solar orbit.

Viking 1 and 2 were designed after the Mariner spacecraft. They consisted
of an orbiter and lander. The orbiter weighed 900 kg and the lander 600 kg.
Viking 1 went into orbit about Mars on June 19, 1976. The lander touched
down on July 20, 1976 on the western slopes of Chryse Planitia. Both
landers had experiments to search for Martian micro-organism. The results
of these experiments are still being debated. The landers provided detailed
color panoramic views of the Martian terrain. They also monitored the Martian
weather. The orbiters mapped the planet's surface, acquiring over 52,000
images. Viking 1 orbiter was deactivate on August 7, 1980 when it ran out
of altitude-control propellant. Viking 1 lander was accidentally shut down
on November 13, 1982, and communication was never regained.

Viking 1 and 2 were designed after the Mariner spacecraft. They consisted
of an orbiter and lander. The orbiter weighed 900 kg and the lander 600 kg.
Viking 2 went into orbit about Mars on July 24, 1976. The lander touched
down on August 7, 1976 at Utopia Planitia. Both
landers had experiments to search for Martian micro-organism. The results
of these experiments are still being debated. The landers provided detailed
color panoramic views of the Martian terrain. They also monitored the Martian
weather. The orbiters mapped the planet's surface, acquiring over 52,000
images. Viking 2 orbiter was deactivate on July 25, 1978 when it ran out
of altitude-control propellant. Viking 2 lander used Viking 1 orbiter as
a communications relay, and had to be shut down at the same time as the
orbiter on August 7, 1980.

Mars Global Surveyor was inserted into an elliptical capture orbit on 12 September 1997.
The spacecraft was initiated due to the loss of the Mars Observer and the basic
design is after the Mars Observer. Mars Global Surveyor is designed to orbit Mars
over a two year period and collect data on the surface morphology,
topography, composition, gravity, atmospheric dynamics, and magnetic field.
This data will be used to investigate the surface processes,
geology, distribution of material, internal properties, evolution of the
magnetic field, and the weather and climate of Mars.

Mars '96 consisted of an orbiter, two landers, and two soil penetrators that
were to reach the planet in September 1997. The rocket carring Mars 96 lifted
off successfully, but as it entered orbit the rocket's fourth stage ignited
prematurely and sent the probe into a wild tumble. It crashed into the ocean
somewhere between the Chilean coast and Easter Island. The spacecraft sank,
carrying with it 270 grams of plutonium-238.

Mars Pathfinder arrived at Mars on July 4, 1997
and impacted the surface at 16:57 UT (12:57 PM EDT) at a velocity of
about 18 m/s (40 mph). It bounced about 15 meters (50 feet) into the air,
bouncing another 15 times and rolling before coming to rest approximately
2.5 minutes after impact and about 1 km from the initial impact site.
The landing site was in the Ares Vallis region is at 19.33 N, 33.55 W
and was named the Sagan Memorial Station.
A six-wheel rover, named Sojourner, rolled onto the Martian surface on
July 6 at about 05:40 UT. Mars Pathfinder returned 2.6 billion bits of
information, including more than 16,000 images from the lander and 550
images from the rover, as well as more than 15 chemical analyses of
rocks and extensive data on winds and other weather factors.
The last successful data transmission was on September 27, 1997,
the 83rd day of the mission since landing on the surface.
This is the second mission in NASA's low-cost Discovery
series.

Japan's Institute of Space and Astronautical Science (ISAS) launched this
probe to study the Martian environment. This will be the first Japanese
spacecraft to reach another planet. The spacecraft will encounter Mars in
December of 2003.

The Mars Climate Orbiter, also known as the Mars Surveyor '98 Orbiter,
was a companion to the Mars Polar Lander. Its
the mission was to study the Martian weather, climate, and water and carbon
dioxide budget. It was destroyed when a navigation error caused it
to miss its target altitude at Mars by 80 to 90 kilometers, instead of entering
the martian atmosphere at an altitude of 57 kilometers during the orbit insertion maneuver.

The Mars Polar Lander, also known as the Mars Surveyor '98 Lander, was a companion
to the Mars Climate Orbiter. It was to touch down on the southern polar layered
terrain, between 73 S and 76 S, less than 1000 km from the south pole, near the
edge of the carbon dioxide ice cap in Mars' late southern spring.
The last telemetry from the spacecraft was sent just prior to atmospheric entry on
3 December 1999. No further signals have been received from the lander, the cause
of this loss of communication is not known.

The Deep Space 2 (DS2) project is a New Millenium mission consisting of
two probes which were to penetrate the surface of
Mars near the south
polar layered terrain and send back data on the sub-surface properties.
On 3 December 1999 the probes were nearing Mars on a trajectory to enter
the atmosphere and bring them to their intended landing site, but contact
was never made with either probe and the mission was presumed lost.

The 2001 Mars Odyssey orbiter will nominally orbit Mars
for three years, with the objective of conducting a detailed mineralogical
analysis of the planet's surface from orbit and measuring the radiation
environment. The mission has as its primary science goals to gather data to
help determine whether the environment on Mars was ever conducive to life, to
characterize the climate and geology of Mars, and to study potential radiation
hazards to possible future astronaut missions.

ars Reconnaissance Orbiter reached Mars and went into orbit on Friday,
10 March 2006. The Mars Reconnaissance Orbiter (MRO) is designed to orbit Mars over a full
martian year and gather data with six scientific instruments, including a
high-resolution imager.

The Phoenix Mars Lander is designed to study the surface and near-surface
environment of a landing site in the high northern area of Mars. It successfully landed on
Mars at 23:53 UT (7:53 p.m. EDT) on Sunday, 25 May 2008.

Pioneer 10 flew by Jupiter on December 1, 1973. It passed 132,250 kilometers
from Jupiter's cloud tops. It returned over 500 images of Jupiter and
its moons. Pioneer 10's greatest achievement was the data collected on Jupiter's
magnetic field, trapped charged particles, and solar wind interactions.
The orbit boundary of Pluto was crossed on June 13, 1983. It has now
left the solar system.

Pioneer 11 flew by Jupiter on December 1, 1974 passing 42,900 kilometers from
Jupiter's cloud tops. It took better pictures than Pioneer 10, and
measured Jupiter's intense charged-particle and magnet field
environment. As it flew by Jupiter it was given a gravity assist which
swung it onto a course for Saturn. On September 1, 1979, Pioneer 11
flew past the outer edge of Saturn's A ring at a range of 3,500 kilometers.
It traveled underneath the ring system and passed 20,930 kilometers from
Saturn's cloud tops. It has now left the solar system.

The Ulysses spacecraft is an international project to study the
poles of the Sun and interstellar space above and below the poles. It
used Jupiter for a gravity assist to swing out of the
ecliptic plane and
onward to the poles of the Sun. The Jupiter flyby was on February 8, 1992.
The first solar polar passage will be in June 1994 and
the spacecraft will pass the solar equator in February 1995.

Galileo was designed to study Jupiter's atmosphere, satellites and
surrounding magnetosphere for 2 years. In order to get there, it used
gravity assist techniques to pick up speed by flying past Venus on
February 10, 1990. It then flew past the Earth & Moon
on December 8, 1990 and then again on December 8, 1992. It has
made encounters with asteroid 951 Gaspra on October 29, 1991, and asteroid
243 Ida on August 28, 1993.

Hubble Space Telescope - USA & Europe Telescope - (April 25, 1990)

The Hubble Space Telescope has taken photographs of Jupiter and other planet. In July 1994, it photographed the collision of Compet Shoemaker-Levy 9 with Jupiter.

Pioneer 11 flew by Jupiter on December 1, 1974 passing 42,900 kilometers from
Jupiter's cloud tops. It took better pictures than Pioneer 10, and
measured Jupiter's intense charged-particle and magnet field
environment. As it flew by Jupiter it was given a gravity assist which
swung it onto a course for Saturn. On September 1, 1979, Pioneer 11
flew past the outer edge of Saturn's A ring at a range of 3,500 kilometers.
It traveled underneath the ring system and passed 20,930 kilometers from
Saturn's cloud tops. It has now left the solar system.

The aim of the joint ESA/NASA Cassini mission will be the exploration of
the whole Saturnian system - the planet itself, its atmosphere, rings and
magnetosphere, and some of its moons (Titan and the icy satellites).
Titan is especially interesting because its atmosphere is supposed to
have properties very close to those of the terrestrial atmosphere in
pre-biotic conditions. The Cassini mission will consist of the
NASA-provided Saturn Orbiter coupled with ESA's Huygens probe, which
will be dropped into Titan's atmosphere. During the three hours of its
descent to the surface of Titan, and after touchdown, Huygens will study
the characteristics of Titan's atmosphere and surface.

New Horizons is a mission designed to fly by Pluto and its moon Charon and
transmit images and data back to Earth. It will then continue on into the
Kuiper Belt where it will fly by a one or more Kuiper Belt Objects and
return further data.

9969 Braille

The Deep Space 1 (DS1) is the first of a series of technology
demonstration probes being developed by NASA's New Millennium
Program. The spacecraft flew by the Mars-crossing near-Earth
asteroid 9969 Braille in July, 1999 and
will fly by comet Borrelly in September 2001.

1 Ceres

Dawn is a mission designed to rendezvous and orbit the asteroidsVesta and Ceres. The scientific objectives are
to characterize the asteroids' internal structure, density, shape, size, composition and mass
and to return data on surface morphology, cratering, and magnetism.

433 Eros

The main scientific purpose of NEAR (Near Earth Asteroid Rendezvous) is to
orbit the near Earth asteroid 433 Eros. The spacecraft is scheduled
to study
the asteroid for one year after entering orbit in January 1999.
NEAR imaged Comet Hyakutake in March 1996 and made a fast flyby of
asteroid 253 Mathilde on June 27, 1997. NEAR is the first of NASA's
Discovery missions and the first to return scientific data.

4 Vesta

Dawn is a mission designed to rendezvous and orbit the asteroidsVesta and Ceres. The scientific objectives are
to characterize the asteroids' internal structure, density, shape, size, composition and mass
and to return data on surface morphology, cratering, and magnetism.

Other Asteroid Missions

Hayabusa (Muses-C) - Japan Asteroid Sample Return - 9 May 2003

The primary scientific objective of the Muses-C mission is to collect a surface
sample of material from an asteroid and return the sample to Earth for
analysis.

Borrelly

The Deep Space 1 (DS1) is the first of a series of technology
demonstration probes being developed by NASA's New Millennium
Program. The spacecraft flew by the Mars-crossing near-Earth
asteroid 9969 Braille in July, 1999 and
will fly by comet Borrelly in September 2001.

Grigg-Skjellerup

After the Halley fly-by, Giotto was put into hibernation, and re-awoken in
1990. Using a close Earth flyby, its trajectory was changed to allow a
close encounter with the Comet Grigg-Skjellerup on July 10th, 1992.
The flyby distance was actually less than that at Halley
(around 200 kilometers from the nucleus).

Vega 1 flew past Venus on June 11, 1985 on its way for a flyby with comet
Halley. It dropped off a Venera style lander and a balloon to investigate
the Venusian middle cloud layer. The lander's soil experiment failed. The
balloon floated in the atmosphere for about 48 hours at an altitude of 54
kilometers. Between Vega 1 and 2, downward gusts of 1 meter/second were
encountered and wind velocities of up to 240 kilometers/hour. The Comet
Halley flyby took place on March 6, 1986. The Vega 1 probe is now in a
solar orbit.

Vega 2 flew past Venus on June 15, 1985 on its way for a flyby with comet
Halley. It dropped off a Venera style lander and a balloon to investigate
the Venusian middle cloud layer. The lander's soil experiment sampled
anorthosite-troctolite which is found in the lunar highlands but is rare
on Earth. The balloon floated in the atmosphere for about 48 hours at an
altitude of 54 kilometers. Between Vega 1 and 2, downward gusts of 1
meter/second were encountered and wind velocities of up to 240
kilometers/hour. The Comet Halley flyby took place on March 9, 1986.
The Vega 2 probe is now in a solar orbit.

Hyakutake

P/Wild

Stardust is scheduled to rendezvous with comet P/Wild 2 in January 2004, study the object, and collect material for analysis on Earth. The return capsule successfully landed in the Utah desert on 15 January 2006.

Other Comet Missions

CONTOUR - USA Fly-by of three Comet Nuclei - 4 July 2002

The Comet Nucleus Tour (CONTOUR) was to fly-by the comets
Encke, Schwassmann-Wachmann-3, d'Arrest and possibly a fourth comet.
The spacecraft was lost after numerous attempts were made to contact it.

Rosetta is European Space Agency (ESA) Horizon 2000 cornerstone mission
number 3 designed to rendezvous with Comet 67 P/Churyumov-Gerasimenko,
drop a probe on the surface, study the comet from orbit, and fly by at
least one asteroid en route.